Can not access Urban Terror due to GLW_StartOpenGL subsystem loading error :(

Hey everyone i'm Srae,
I've been having problems with my younger brothers laptop, he plays an online shooter called Urban Terror and used to play it on the laptop. That was until he managed to acquire some viruses and we had to wipe clean the whole machine and have a mate reformat the hardrive. However since then he hasn't been able to play it due to a OpenGL subsystem loading error. Here is what it comes up with: